Replace wahlhelfer binary installation by comment

uwsgi-python/tasks/apps/wahlhelfer.yml

 ---
 
-- name: ensure we have the linear solver
-  copy:
-    src: "apps/{{ item }}"
-    dest: "{{ app_path }}/zibopt/"
-    owner: "{{ app_user }}"
-    group: "{{ app_group }}"
-    mode: '0755'
-  with_items:
-    - scip
-    - zimpl
-  tags:
-    - wahlhelfer
-    - webservices
+# You need to put the executables 'scip' and 'zimpl' in the directory
+# 'zibopt' (in {{app_path}}). You can download them from scipopt.org.
+
+#- name: ensure we have the linear solver
+#  copy:
+#    src: "apps/{{ item }}"
+#    dest: "{{ app_path }}/zibopt/"
+#    owner: "{{ app_user }}"
+#    group: "{{ app_group }}"
+#    mode: '0755'
+#  with_items:
+#    - scip
+#    - zimpl
+#  tags:
+#    - wahlhelfer
+#    - webservices